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x in (-oo:+oo)
(-2/5)*x = 8/35 // - 8/35
(-2/5)*x-(8/35) = 0
(-2/5)*x-8/35 = 0
-2/5*x-8/35 = 0 // + 8/35
-2/5*x = 8/35 // : -2/5
x = 8/35/(-2/5)
x = -4/7
x = -4/7
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